module UsersHelper
        def gravatar_for(user,  size: 80)
                # size   = options[:size]
                 gravatar_id  = Digest::MD5::hexdigest(user.email.downcase)
                 gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
                image_tag(gravatar_url, alt: user.name, class: "gravatar")
        end
end